Ancient Skulls Rewrite East Asian Hominin History
Yunxian, China – Two fossilised skulls unearthed in Yunxian, northern China, have undergone a significant re-dating, pushing their age back to approximately 1.77 million years ago. This groundbreaking discovery positions them as the oldest known hominin remains in East Asia, dramatically altering our understanding of human dispersal across Eurasia. The revised chronology challenges recent theories that linked these skulls to Denisovans, instead firmly identifying them as early Homo erectus.
The new dating, published in the prestigious journal Science Advances, offers what researchers describe as a more robust chronological framework for comprehending the presence of early hominins in China.
Yunxian Fossils Re-dated to 1.77 Million Years Old
The revised age of the Yunxian fossils is the result of meticulous isotopic analysis conducted on the sediment layers surrounding the skulls. A team led by paleoanthropologist Hua Tu of Shantou University employed advanced techniques, measuring the ratios of aluminium-26 to beryllium-10 within quartz grains found in the fossil-bearing strata.
According to the findings presented in Science Advances, the data strongly suggest that the individuals represented by these skulls lived around 1.77 million years ago. This places them remarkably close in time to the emergence of Homo erectus in Africa, which is estimated to have occurred approximately 1.9 million years ago. The temporal proximity implies a rapid eastward expansion from Africa shortly after the species’ origin.
Prior to this re-dating, the oldest widely accepted hominin fossils found outside of Africa were from Dmanisi Cave in Georgia, with an estimated age range of 1.85 to 1.77 million years. The Yunxian fossils now appear to be almost contemporaneous with these Georgian remains, suggesting that hominins had established a presence in both Western Eurasia and Central China within a relatively compressed timeframe.
Previously, the next oldest Homo erectus fossils discovered in China were those from Gongwangling, located north of Yunxian, dated to 1.63 million years ago. The substantial age gap between the Gongwangling fossils and earlier findings had previously led to the inference of a slower, more gradual eastward migration. The new date for the Yunxian skulls effectively compresses this timeline, indicating a much swifter colonisation of East Asia.
The Denisovan Hypothesis Faces a Setback
The revised dating of the Yunxian skulls directly contradicts a study published in September 2025, which proposed that these remains were closely related to Denisovans, a group also referred to as Homo longi. That earlier research involved the digital reconstruction of one of the Yunxian skulls, leading to the conclusion that it bore a resemblance to a 146,000-year-old cranium found in Harbin. This Harbin cranium had been identified as Denisovan through recent DNA studies. Based on the paleomagnetic dating available at the time, the authors of that study argued that the Yunxian individuals lived not long after the Denisovan lineage diverged from the broader human family tree. They even suggested a revised evolutionary tree where modern humans and Denisovans were more closely related to each other than either group was to Neanderthals.
However, the new, significantly earlier age for the Yunxian fossils makes such a scenario highly improbable. Paleoanthropologist John Hawks of the University of Wisconsin, who was not involved in the recent study but provided expert commentary, stated, “1.77 million years is just too old to be a credible connection to the Denisovan group, which DNA tells us got started after around 700,000 years ago.” With this earlier age established, the Yunxian skulls are now more convincingly interpreted as belonging to Homo erectus rather than representing an early Denisovan lineage.
Early Migrations Re-examined in Light of Tool Discoveries
The implications of the Yunxian re-dating are further amplified when considered alongside other significant archaeological finds in China. At Shangchen, situated on the southern fringes of the Loess Plateau, archaeologists have unearthed stone tools dated to an astonishing 2.1 million years ago. Similarly, at Xihoudu in northern China, stone artifacts have been dated to 2.43 million years ago. While these sites have yielded invaluable evidence of early tool use, they have so far failed to produce any hominin fossils.
Christopher Bae of the University of Hawai‘i at Mānoa, a co-author of the new Yunxian study, highlighted the puzzle presented by these ancient tools: “If you have a site in China that’s 2.43 million years, and the origin of Homo erectus is 1.9 million years ago, either you need to push the origin of Homo erectus back to 2.5 or 2.6 million years or we need to accept that we need to be looking at other hominins that may have actually moved out of Africa.”
The identity of the hominin species responsible for these exceptionally old stone tools remains a subject of speculation. Possible candidates include earlier hominin species such as Homo habilis or Homo rudolfensis. The absence of hominin fossils at the Shangchen and Xihoudu sites makes it challenging to definitively attribute the tools to a specific species, underscoring the ongoing quest to piece together the complex mosaic of early human migration and evolution.
